Handling COM port under NT service

Hi All,

I've got a big problem. I wrote a service under WINNT which      
asks the SERIAL Port, and put the characters into a file.
The problem is, I don't know when is data in the input buffer. My program contains a loop which never ends and the CP usage is nearly 100%. As far as I know, the sender sends a signal which indicates that the data is valid. How can I mask it?
Is there any solution?

Thanks in advance

ANdrew
bandi081497Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

altenaCommented:
Remove the loop, check out the "WaitCommEvent" function
in the Win32 Help/documentation.

You can have the OS "wake your progam" whenever something
interesting happens at the COMM port.
0
ZifNabCommented:
Hi bandi,

Well, maybe this helps, it is a freeware component! So if you want to write it on your own, be my guest, but then I can't help you. I use this component already a long time and it works perfectly!!! Really I don't think it's nessecarry to put all your time in writing such a component on your own. It's even with source so..... I let it up to you to decide if you want to use this component are not. If not just reject my answer... but really, have first a glimp at it before you do!!!

author : M. Cocco.
E-mail: d3k@mdnet.it
URL   : http://www.mdlive.com/d3k/
--------------------------------------

Regards, Zif.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.